To follow up on this thread... During 2018 I grew S pennellii again. They were planted into one gallon pots, in the variety of compost that they grew best in during early season trials. They did better than every before, and produced a good amount of seeds.
One plant had larger fruits than typical. I saved seed from that separately.
One plant was isolated from the rest of the S pennellii plants, and grown in an area with interspecies hybrids. Since S pennellii is self-incompatible and requires a pollinator, I'm looking forward to growing these out to see if they were pollinated by the interspecies hybrids.
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